JPH0517784Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a
Regarding the pressure regulator of CRT (Cathode Ray Tube) liquid cooling section.

FIG. 1 is a cross-sectional view of a conventional liquid-cooled CRT.
In this figure 1, CRT1 and glass panel 5
The CRT 1 and the glass panel 5 are bonded together with silicone rubber 4 via a mounting bracket 2, and a cooling liquid 3 is sealed between the CRT 1 and the glass panel 5.

By the way, the temperature of the CRT in a projection television increases rapidly, making it difficult to increase the brightness. For this reason, liquid cooling of the CRT1 is very effective.
In this operation, heat generated by the CRT 1 is transferred to the fixture 2 through the cooling liquid 3. The fixture 2 also functions as a heat sink, and therefore the heat is dissipated by the fixture 2.

In addition, if a lens (not shown) is directly attached instead of the glass panel 5 and a coolant with a refractive index close to that of the face plate of the CRT 1 and the lens is used, reflections between the CRT 1 and the lens can be almost eliminated. It can be reduced to 0, contributes to improving contrast, and is very effective for cooling.
You can truly kill two birds with one stone.

However, as the temperature of CRT 1 rises, the temperature of coolant 3 also rises, and as a result,
The cooling liquid 3 undergoes volumetric expansion. Conventionally, expansion was suppressed by firmly bonding the face plate of the CRT 1, the fixture 2, and the glass panel 5.
This results in very high internal pressure.

Furthermore, when the lens and the face plate of the CRT 1 are integrated, the amount of coolant increases due to the back focus of the lens, and the amount of expansion increases accordingly, making it extremely difficult to simply fill in the coolant.

This idea was made to eliminate the above-mentioned drawbacks of the conventional technology. By providing a pressure regulating valve in the cooling section, the pressure of the coolant can be kept almost constant and reliability can be improved. The purpose is to provide equipment.

Hereinafter, embodiments of the coolant pressure regulating device of this invention will be described based on the drawings. FIG. 2 is a cross-sectional view showing the configuration of one embodiment. In FIG. 2, the same parts as in FIG. 1 will be described with the same reference numerals.

A lens 6 is attached to the face plate of the CRT 1 via a fixture/heatsink 2, and silicone rubber 4 is provided between the lens 6 and the fixture/heatsink 2 and between the face plate and the fixture/heatsink 2. is interposed therebetween, and the fixture/radiator 2 and the lens are attached to the face plate via this silicone rubber 4.

As is clear from the figure, a part of this fixture/radiator 2 has a communication hole 2 that communicates from the inside to the outside surface.
a is integrally formed. A pressure regulating section 7 is provided at the open end of the outer surface of the communication hole 2a of the fixture/radiator 2.

This pressure regulating section 7 is shown enlarged in FIGS. 3a and 3b. 3a and 3b are diagrams for explaining the action of the pressure regulating section 7. FIG. This figure 3 a,
As is clear from both figures in FIG. 3b, the opening end of the outer surface of the communication hole 2a of the fixture/radiator 2 is covered with the pressure regulating rubber 8, and the adhesive part 9 of the rubber 8 is glued. It is installed with.

Note that the inside surrounded by the fixture/radiator 2, the face plate, and the lens 6 is filled with a cooling liquid 3, as in the case of FIG. 1.

Next, the operation of the coolant pressure regulating device of this invention constructed as described above will be explained. Since the pressure regulating rubber 8 is attached to the open end of the outer surface of the communication hole 2a of the fixture/radiator 2, when the coolant 3 expands due to a temperature rise, the pressure regulating rubber 8 will be in the state shown in Fig. 3a. As shown in FIG. 3b, this prevents the internal pressure inside the fixture/radiator 2 surrounded by the face plate and lens 6 from becoming extremely high.

Furthermore, when the cooling liquid 3 contracts due to a drop in the temperature of the cooling liquid 3, the pressure regulating rubber 8 will now, contrary to the above,
The state shown in FIG. 3b returns to the state shown in FIG. 3a.

In addition, in the above embodiment, a case is shown in which the cooling liquid 3 is sealed in the space surrounded by the lens 6, the face plate of the CRT 1, and the fixture/radiator 2.
Instead of the lens 6, it may simply be a glass panel, as shown in FIG.

As described above, according to the coolant pressure regulating device of this invention, the open end of the communication hole that communicates from the inner surface to the outer surface of the space filled with the coolant of the fixture and radiator is connected to the fixture and radiator. The elastic membrane for pressure regulation is attached to the opening end by accommodating the expandable part of the elastic membrane for pressure regulation in the opening of the opening end, and the elastic membrane for pressure regulation is attached to the opening end. Since the structure is configured to absorb the energy through elastic deformation of the elastic membrane, the internal pressure of the coolant sealed inside the fixture/radiator can be kept almost constant at all times, and there is no need for particularly strong adhesion. There is no need to worry about liquid leakage or air intrusion, and reliability can be greatly improved.

In addition, the elastic film for pressure regulation acts to stretch and provides sufficient response, so even when the amount of cooling liquid is large due to back focus etc. and the expansion amount is large, it is possible to It becomes something that cannot be done.

Furthermore, since the communication hole and the inside of the pressure regulating elastic membrane are also filled with the cooling liquid, the heat radiation area is increased and the heat radiation effect is improved.

In addition, the structure is such that a pressure regulating elastic membrane is attached to the open end of the outside surface of the communication hole, making it easy to assemble the cooling device and work reliably.
Not only is the cost of the equipment extremely low, but
Since the pressure regulating part made of an elastic membrane for pressure regulation does not protrude around the fixture and radiator, there are no restrictions when installing it on a television, etc., and the device itself does not need to be large. . Furthermore, the pressure regulating section does not get in the way during transportation and is easy to handle.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional cooled CRT;
The figure is a cross-sectional view showing the configuration of an embodiment of the coolant pressure regulating device of this invention, and FIGS. 3a and 3b are enlarged cross-sections of the pressure regulating section 7 in the coolant pressure regulating device of FIG. 2, respectively. It is a diagram. 1...CRT, 2...Mounting fixture/radiator, 3...
Coolant, 4...Silicone rubber, 6...Lens, 7
...Pressure regulating part, 8...Pressure regulating rubber, 9...Adhesive part.

Claims (1)

[Scope of utility model registration request] a cathode ray tube; a glass panel or lens arranged to face and be spaced apart from the face plate of the cathode ray tube; a fixture and radiator that covers a space between the face plate of the cathode ray tube and the glass panel or lens; It consists of a face plate, a glass panel or a lens, and a cooling liquid filled in a space surrounded by the fixture and radiator, and the fixture and radiator has a communication hole that communicates from the inner surface to the outer surface on the side of the space. An opening end of the communication hole is integrally provided, and a pressure regulating elastic membrane is provided at the opening end of the communication hole to adjust the pressure of the cooling fluid by expanding and contracting following the change in volume due to the temperature of the cooling fluid. The cooling device is characterized in that the expandable and contractible portion of the pressure regulating elastic membrane is housed and attached within the opening of the opening end, and the cooling liquid is also filled inside the communication hole and the pressure regulating elastic membrane. Liquid pressure regulating device.